I'd like to suggest a "drawWhiteSpace tabs" option, which would only draw tab whitespace characters.

It would be useful in the case where you are using "translateTabsToSpaces true" because it would allow you to spot any unwanted tab characters at a glance (without the uglification of having all whitespace visible).

This would be useful in any language, but it would be particularly useful in Python where mixed tabs and spaces are a bad thing.